Expression of type Equals

from the theory of proveit.physics.quantum.algebra

import proveit
# Automation is not needed when building an expression:
proveit.defaults.automation = False # This will speed things up.
proveit.defaults.inline_pngs = False # Makes files smaller.
%load_expr # Load the stored expression as 'stored_expr'
# import Expression classes needed to build the expression
from proveit import B, D, alpha, beta
from proveit.linear_algebra import VecAdd
from proveit.logic import Equals
from proveit.physics.quantum import Qmult, ket_psi, ket_varphi

# build up the expression from sub-expressions
sub_expr1 = VecAdd(Qmult(B, ket_psi), ket_varphi)
expr = Equals(Qmult(alpha, D, beta, sub_expr1), Qmult(Qmult(alpha, D, beta), sub_expr1)).with_wrapping_at(2)

expr:

# check that the built expression is the same as the stored expression
assert expr == stored_expr
assert expr._style_id == stored_expr._style_id
print("Passed sanity check: expr matches stored_expr")

Passed sanity check: expr matches stored_expr

# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())

\begin{array}{c} \begin{array}{l} \left(\alpha \thinspace D \thinspace \beta \thinspace \left(\left(B \thinspace \lvert \psi \rangle\right) + \lvert \varphi \rangle\right)\right) =  \\ \left(\left(\alpha \thinspace D \thinspace \beta\right) \thinspace \left(\left(B \thinspace \lvert \psi \rangle\right) + \lvert \varphi \rangle\right)\right) \end{array} \end{array}

stored_expr.style_options()

name	description	default	current value	related methods
operation	'infix' or 'function' style formatting	infix	infix
wrap_positions	position(s) at which wrapping is to occur; '2 n - 1' is after the nth operand, '2 n' is after the nth operation.	()	(2)	('with_wrapping_at', 'with_wrap_before_operator', 'with_wrap_after_operator', 'without_wrapping', 'wrap_positions')
justification	if any wrap positions are set, justify to the 'left', 'center', or 'right'	center	center	('with_justification',)
direction	Direction of the relation (normal or reversed)	normal	normal	('with_direction_reversed', 'is_reversed')

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Operation	operator: 1 operands: 2
1	Literal
2	ExprTuple	3, 4
3	Operation	operator: 17 operands: 5
4	Operation	operator: 17 operands: 6
5	ExprTuple	12, 13, 14, 8
6	ExprTuple	7, 8
7	Operation	operator: 17 operands: 9
8	Operation	operator: 10 operands: 11
9	ExprTuple	12, 13, 14
10	Literal
11	ExprTuple	15, 16
12	Variable
13	Variable
14	Variable
15	Operation	operator: 17 operands: 18
16	Operation	operator: 23 operand: 22
17	Literal
18	ExprTuple	20, 21
19	ExprTuple	22
20	Variable
21	Operation	operator: 23 operand: 25
22	Variable
23	Literal
24	ExprTuple	25
25	Variable